Map: North High School

PHOENIX -- Phoenix police have given the all-clear after responding to a bomb threat at North High School Friday morning.

According to police, somebody phoned in the threat to the school nurse's office at about 7:30 a.m. School officials immediately made the decision to evacuate. Aerial video showed the students congregated on far side of the football field. By about 9:15 a.m., those kids were being moved into the gym where it was cooler.

Officers swept the campus and used bomb-sniffing dogs to check the lockers. They found nothing suspicious or potentially dangerous.

This is the second such threat at a Phoenix school in two days.

On Thursday, a called-in bomb threat at Longview Elementary School proved to be a hoax, but no matter what, such threats are always taken seriously.

"We don't have the luxury of ... walking away from these [threats]. We have to treat it as legitimate," Phoenix Police Sgt. Steve Martos said, explaining that the department would always err on the side of caution and devote an abundance of resources to handle this kind of situation.

Police wrapped up their search by about 10 a.m., allowing students to return to their classrooms and the school to resume normal operations.

According to the school's website, "North High has been recognized as one of the top high schools in the United States by Newsweek magazine and annually graduates students who exceed state and national standards."

Today is the last day of AIMS testing. It's not clear how the evacuation will affect Friday's testing schedule at North.

The person who made the call that triggered Friday morning's evacuation and search could face charges for false reporting.

According to A.R.S. § 13-2907, false reporting is a class 1 misdemeanor. A second violation is a class 6 felony. A person convicted of false reporting could be on the hook "for the expenses that are incurred incident to the emergency response or the investigation of the commission of false reporting ...."